The Pro-Ject 87g counterweight is a genuine spare and upgrade part for Pro-Ject tonearms built around the 043 tonearm assembly. A counterweight must be correctly matched to the cartridge being used: when a cartridge is too heavy for the standard counterweight to balance properly, it cannot apply accurate tracking force, leading to degraded sound quality and potential stylus or record damage.
Replacing the standard counterweight with this 87g version allows heavier cartridges to be balanced correctly within the tonearm's recommended tracking force range. The counterweight fits directly onto the tonearm stub, locking into position with a grub screw, and the tracking force is then set by sliding the counterweight along the stub in the usual way.
If you are upgrading your cartridge to a heavier model or replacing a lost or damaged counterweight, confirm your tonearm uses the 043 assembly before ordering. The weight (043) designation refers to Pro-Ject's internal component coding for this counterweight series.